2011 Mercedes GL450 A/C problem . OBDI scanner said " 9304 M13 heating water circulation pump open circuit

My A/C blows hot air for a moment then blow cold few minutes and then hot again and cold, eventually blow hot.

Refilled freon, replaced refrigerant pressure sensor, replace auxiliary water pump still blow hot air.

OBDI scanner still said "9304 M13 heating water circulation pump open circuit".

Is there auxiliary water pump (heating water circulation pump) relay or fuse?

Please advice.

 

God Bless,

Comments

user profile image
Diddeo made a comment.
3 months ago

Did you happen to ever figure out how to fix this issue?

I have a 2008 GL450 and have the same issue..

 

Thanks

 
user profile image
rockkang made a comment.
3 months ago

No, I have not. but I took the car to shop for other reason and told them the AC issues and they checked and adjust the freon pressure.

Basically it was too much freon. after that it worked for a moment ( 2 hours) then went back to same as before.

I guess I have to go to the repair shop.

 

good luck.

 

 
user profile image
Diddeo made a comment.
3 months ago

 

 

 

 
user profile image
Diddeo made a comment.
3 months ago

sorry i obviously didnt read your entire first post until now..

as i mentioned mine was just the wire connector.. maybe the wire is frayed or nicked?

 

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